Update Type: Replacement Test
Test Updated: 12/08/2021
Test Overview
Test Methodology

Flow Cytometry

Test Usage

Approximately 40% of patients with chronic urticaria have antibodies to the high affinity IgE receptor (FceR1). Sera from patients with chronic urticaria significantly upregulate basophil CD203c expression as measured by flow cytometry.

Reference Range *

0 - 12

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details
Days Set Up
Monday, Thursday
Analytic Time

11 - 15 days

Soft Order Code
  • Anti-CD203
  • CD203 Antibody
  • Anti-FcER1 Antibody
Reference Laboratory
Mayo FIERA (National Jewish Health)
Special Testing
Specimen Requirements
Collection Instructions

Collect specimen in a red top or SST tube. Centrifuge, aliquot serum into a plastic vial within 1 hour of collection and refrigerate up to 7 days or freeze for longer storage.

Normal Volume
1 mL serum
Minimum Volume
0.5 mL serum
Storage Temperature
Frozen preferred, refrigerated acceptable
Additional Information

Test sent to Mayo Medical Laboratories; performed by National Jewish Health.

CPT Code
88184, 88185 x2
Fee Code
AA549, AA550 x2